The February 2021 issue of Houbunsha’s Manga Time Kirara Forward magazine affirmed on Thursday that Maiko Uchino’s Slow Loop manga is motivating a TV anime.
Uchino attracted an outline to commend the anime news:

The Slow Loop manga focuses on Hiyori, a young lady who appreciates fly fishing by the sea shore, an action passed down to her by her late dad. On one ordinary day at the sea shore, she ends up gathering Koharu, who turns out to be her new stepsister from her mom’s new marriage.
Uchino distributed a one-shot manga with a similar title in Manga Time Kirara Forward in April 2018, preceding dispatching a full serialization in September 2018. Houbunsha distributed the manga’s third arranged book volume on June 12, and will distribute the fourth volume on January 12.